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2. Summary of Significant Accounting Policies (Details) - Revenue from External Customers by Geographic Areas - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Geography                    
Revenues $ 4,103,159 $ 3,975,736 $ 2,222,941 $ 1,814,214 $ 2,069,553 $ 2,625,793 $ 1,787,165 $ 3,542,077 $ 12,116,050 $ 10,024,588
UNITED STATES                    
Geography                    
Revenues                 9,677,822 7,424,780
INTERNATIONAL                    
Geography                    
Revenues                 $ 2,438,228 $ 2,599,808